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13-4x=15-7x
We move all terms to the left:
13-4x-(15-7x)=0
We add all the numbers together, and all the variables
-4x-(-7x+15)+13=0
We get rid of parentheses
-4x+7x-15+13=0
We add all the numbers together, and all the variables
3x-2=0
We move all terms containing x to the left, all other terms to the right
3x=2
x=2/3
x=2/3
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